Free, open-source tool for backing up Microsoft 365 Data – Corso
Free, Secure, and Open-Source Backup for Microsoft 365 - alcionai/corso
Free, open-source tool for backing up Microsoft 365 Data – Corso launched on January 19, 2023 with 34 votes, #1,248 of 3,901 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 3 years on.
In plain words
Corso is a free, open-source backup tool designed for Microsoft 365 data. It enables users to back up and restore information from Microsoft 365 services. The tool is built for developers and IT administrators who need to protect their organization's cloud data. Being open-source and available on GitHub, it allows community contributions and transparency in how backups are managed.
written from the facts on this page · September 2026
Does a similar job
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Plakar2025 · plakar.io · ▲288It’s still young, but they are shipping fast, and it's open source. Anyone else playing with it?
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NFreezer – Encrypted-at-rest remote backup tool2020 · github.com · ▲96nFreezer is an encrypted-at-rest backup tool. Contribute to josephernest/nfreezer development by creating an account on GitHub.
Relica – Cross-platform local, remote, and multi-cloud file backups2018 · relicabackup.com · ▲132Immutable cloud storage with multi-cloud redundancy. Zero-knowledge encryption, unlimited devices. Built on restic — no vendor lock-in. From $5/month.

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